Thanks for the great suggestions, all.
Unfortunately I won't be picking up any older sports cars, since I'll be putting a lot of miles on her in traffic (wouldn't want to subject a nice RX-7 to that fate).
I hadn't considered a Volvo, but will look into it. I need something that will not be too flashy (since I'll still be an associate), or too dull (since I will be an attorney), too sporty (since I may be driving colleagues and clients), but fun enough for a commute. Usable backseat space is a must, so GT-86 and Fiesta ST are out. I've decided that 4 doors is a must too.
Right now I'm thinking a Golf, GTI, CPO 328i, 4 door Cooper. Will look into a Volvo as well, although I might hold off and buy a new XC90 when I make partner